Hi, does anyone know for sure what front wheel is for a 1951 A10 plunger. What I mean is when you look at the back of the brake hub there are six large bubbles when you are looking at the hub from primary side. In the 1949-53 parts lists it shows smooth but in Roy Bacon book for all the pictures of 1950 and 51 A10s it show the bubbles. I know there were later models with knock outs and bubbles they are in Bacon restoration book too. thanks Terry